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Finding the Fourth Proportional to 186.89, 280.38 and 78.71

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Solution

The fourth proportional to 186.89, 280.38 and 78.71 is: 118.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.89 : 280.38 = 78.71 : x
  2. Step 2: Convert to fraction form
    186.89/280.38 = 78.71/x
  3. Step 3: Cross multiply
    186.89x = 280.38 × 78.71
  4. Step 4: Simplify right side
    186.89x = 22,068.71
  5. Step 5: Solve for x
    x = 22,068.71/186.89
  6. Step 6: Final answer
    x = 118.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.